Battery pack

Abstract

A battery pack includes a plurality of battery modules each including a plurality of battery cells; and a pack housing having a plurality of accommodation spaces in which the plurality of battery modules are accommodated, wherein the pack housing includes a plurality of venting holes disposed on an external surface of the pack housing and configured to discharge gas generated from the plurality of battery modules, and wherein each of the plurality of accommodation spaces is configured to communicate with a different venting hole among the plurality of venting holes.

What is claimed is: 
     
         1 . A battery pack, comprising:
 a plurality of battery modules each including a plurality of battery cells; and   a pack housing having a plurality of accommodation spaces in which the plurality of battery modules are accommodated,   wherein the pack housing includes a plurality of venting holes disposed on an external surface of the pack housing and configured to discharge gas generated from the plurality of battery modules, and   wherein each of the plurality of accommodation spaces is configured to communicate with a different venting hole among the plurality of venting holes.   
     
     
         2 . The battery pack of  claim 1 , wherein the pack housing includes:
 a lower frame on which the plurality of battery modules are seated;   a first side frame including a plurality of flow passages through which the gas can flow, wherein each of the plurality of flow passages is configured to communicate with a different accommodation space among the plurality of accommodation spaces;   a second side frame intersecting the first side frame; and   a cross frame connected to the lower frame and disposed between the plurality of accommodation spaces.   
     
     
         3 . The battery pack of  claim 2 ,
 wherein the plurality of venting holes include a first venting hole and a second venting hole spaced apart from each other, and   wherein the plurality of flow passages include:   a first flow passage configured to communicate with the first venting hole; and   a second flow passage configured to communicate with the second venting hole and partitioned from the first flow passage.   
     
     
         4 . The battery pack of  claim 3 , wherein the first flow passage and the second flow passage extend in a length direction of the first side frame. 
     
     
         5 . The battery pack of  claim 2 ,
 wherein at least one of the plurality of battery modules includes an discharge port configured to allow gas generated from the plurality of battery cells to be discharged, and   wherein the first side frame includes a first communication hole opposing the discharge port and configured to communicate with one of the plurality of flow passages.   
     
     
         6 . The battery pack of  claim 3 ,
 wherein the plurality of venting holes further includes a third venting hole spaced apart from the first venting hole and the second venting hole, and   wherein the second side frame includes:   a third flow passage configured to communicate with the first venting hole; and   a fourth flow passage configured to communicate with the third venting hole and partitioned from the third flow passage.   
     
     
         7 . The battery pack of  claim 6 , wherein the second side frame includes a second communication hole disposed adjacent to an end of the cross frame and configured to communicate with the third flow passage or the fourth flow passage. 
     
     
         8 . The battery pack of  claim 2 ,
 wherein at least one of the plurality of battery modules includes:   a cell stack in which the plurality of battery cells are stacked; and   an upper cover covering an upper portion of the cell stack, and   wherein the upper cover is coupled to the pack housing.   
     
     
         9 . The battery pack of  claim 8 , wherein at least one side of the upper cover is coupled to the first side frame or the cross frame and is configured to block the gas from flowing between the upper cover and the pack housing. 
     
     
         10 . The battery pack of  claim 8 , wherein the upper cover includes:
 a body portion opposing the cell stack; and   a plurality of flange portions connected to the body portion and coupled to the pack housing.   
     
     
         11 . The battery pack of  claim 10 ,
 wherein one of the plurality of flange portions is coupled to the first side frame, and   wherein the other of the plurality of flange portions is coupled to the cross frame.   
     
     
         12 . The battery pack of  claim 10 ,
 wherein the cross frame includes a coupling portion protruding in a direction toward the first side frame and coupled to the flange portion, and   wherein a fifth flow passage through which gas generated from the plurality of battery modules flows is formed below the coupling portion.   
     
     
         13 . The battery pack of  claim 10 , wherein a step is formed between the body portion and the plurality of flange portions. 
     
     
         14 . The battery pack of  claim 8 , further comprising:
 a sealing member coupled to the upper cover and covering between the upper cover and the cross frame.   
     
     
         15 . The battery pack of  claim 8 , wherein at least one of the plurality of battery modules includes:
 a busbar assembly including a busbar electrically connected to the cell stack;   a side cover disposed between the busbar assembly and the first side frame; and   a shielding member disposed between the side cover and the busbar assembly and configured to prevent gas from flowing in a direction from the side cover toward the cell stack.   
     
     
         16 . The battery pack of  claim 15 , wherein the shielding member includes ceramic wool. 
     
     
         17 . The battery pack of  claim 2 ,
 wherein the lower frame includes a third communication hole configured to communicate with one of the plurality of accommodation spaces, and   wherein at least one of the plurality of venting holes is disposed on a lower surface of the lower frame and configured to allow gas flowing into the third communication hole to be discharged.   
     
     
         18 . The battery pack of  claim 1 , wherein the number of accommodation spaces and the number of venting holes are the same.